diff --git a/node/index.d.ts b/node/index.d.ts
index ca6e83a267..55f1fd947f 100644
--- a/node/index.d.ts
+++ b/node/index.d.ts
@@ -1546,22 +1546,20 @@ declare module "readline" {
         prependOnceListener(event: "SIGTSTP", listener: () => void): this;
     }
 
-    export interface Completer {
-        (line: string): CompleterResult;
-        (line: string, callback: (err: any, result: CompleterResult) => void): any;
-    }
+    type Completer = (line: string) => CompleterResult;
+    type AsyncCompleter = (line: string, callback: (err: any, result: CompleterResult) => void) => any;
 
     export type CompleterResult = [string[], string];
 
     export interface ReadLineOptions {
         input: NodeJS.ReadableStream;
         output?: NodeJS.WritableStream;
-        completer?: Completer;
+        completer?: Completer | AsyncCompleter;
         terminal?: boolean;
         historySize?: number;
     }
 
-    export function createInterface(input: NodeJS.ReadableStream, output?: NodeJS.WritableStream, completer?: Completer, terminal?: boolean): ReadLine;
+    export function createInterface(input: NodeJS.ReadableStream, output?: NodeJS.WritableStream, completer?: Completer | AsyncCompleter, terminal?: boolean): ReadLine;
     export function createInterface(options: ReadLineOptions): ReadLine;
 
     export function cursorTo(stream: NodeJS.WritableStream, x: number, y: number): void;
diff --git a/node/node-tests.ts b/node/node-tests.ts
index 04166bc006..325b95f266 100644
--- a/node/node-tests.ts
+++ b/node/node-tests.ts
@@ -1265,6 +1265,12 @@ namespace readline_tests {
                 return [['test'], 'test'];
             }
         });
+        result = readline.createInterface({
+            input: input,
+            completer: function(str: string, callback: (err: any, result: readline.CompleterResult) => void): any {
+                callback(null, [['test'], 'test']);
+            }
+        });
     }
 
     {